<!DOCTYPE html>
<html class="writer-html5" lang="en" data-content_root="../">
<head>
  <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />

  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>FAQ &mdash; The Logtalk Handbook v3.93.0-b01 documentation</title>
      <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=d75fae25" />
      <link rel="stylesheet" type="text/css" href="../_static/css/theme.css?v=19f00094" />
      <link rel="stylesheet" type="text/css" href="../_static/css/custom.css?v=396eccfe" />

  
  <!--[if lt IE 9]>
    <script src="../_static/js/html5shiv.min.js"></script>
  <![endif]-->
  
        <script src="../_static/jquery.js?v=5d32c60e"></script>
        <script src="../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
        <script src="../_static/documentation_options.js?v=c8100655"></script>
        <script src="../_static/doctools.js?v=9a2dae69"></script>
        <script src="../_static/sphinx_highlight.js?v=dc90522c"></script>
    <script src="../_static/js/theme.js"></script>
    <!-- begin favicon -->
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
    <link rel="manifest" href="/site.webmanifest" />
    <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5" />
    <meta name="msapplication-TileColor" content="#355b95" />
    <meta name="theme-color" content="#ffffff" />
    <!-- end favicon -->
    
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="next" title="General" href="general.html" />
    <link rel="prev" title="Profiling programs" href="../tutorial/profiling.html" />
   
</head>

<body class="wy-body-for-nav"> 
  <div class="wy-grid-for-nav">
    <nav data-toggle="wy-nav-shift" class="wy-nav-side">
      <div class="wy-side-scroll">
        <div class="wy-side-nav-search" >

          
          
          <a href="../index.html" class="icon icon-home">
            The Logtalk Handbook
              <img src="../_static/logtalk.gif" class="logo" alt="Logo"/>
          </a>
              <div class="version">
                3.93.0
              </div>
<div role="search">
  <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
    <input type="text" name="q" placeholder="Search docs" aria-label="Search docs" />
    <input type="hidden" name="check_keywords" value="yes" />
    <input type="hidden" name="area" value="default" />
  </form>
</div>
        </div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
    
              <p class="caption" role="heading"><span class="caption-text">Contents</span></p>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../userman/index.html">User Manual</a></li>
<li class="toctree-l1"><a class="reference internal" href="../refman/index.html">Reference Manual</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">FAQ</a><ul>
<li class="toctree-l2"><a class="reference internal" href="general.html">General</a></li>
<li class="toctree-l2"><a class="reference internal" href="compatibility.html">Compatibility</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html">Installation</a></li>
<li class="toctree-l2"><a class="reference internal" href="portability.html">Portability</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html">Programming</a></li>
<li class="toctree-l2"><a class="reference internal" href="troubleshooting.html">Troubleshooting</a></li>
<li class="toctree-l2"><a class="reference internal" href="usability.html">Usability</a></li>
<li class="toctree-l2"><a class="reference internal" href="deployment.html">Deployment</a></li>
<li class="toctree-l2"><a class="reference internal" href="performance.html">Performance</a></li>
<li class="toctree-l2"><a class="reference internal" href="licensing.html">Licensing</a></li>
<li class="toctree-l2"><a class="reference internal" href="support.html">Support</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../devtools/index.html">Developer Tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a></li>
<li class="toctree-l1"><a class="reference internal" href="../ports/index.html">Ports</a></li>
<li class="toctree-l1"><a class="reference internal" href="../contributions/index.html">Contributions</a></li>
<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li>
<li class="toctree-l1"><a class="reference internal" href="../bibliography.html">Bibliography</a></li>
<li class="toctree-l1"><a class="reference internal" href="../genindex.html">Index</a></li>
</ul>

    <p class="caption"><span class="caption-text">External Contents</span></p>
    <ul>
    <li class="toctree-l1"><a class="reference internal" href="../../apis/index.html">APIs</a></li>
    <li class="toctree-l1"><a class="reference internal" href="https://logtalk.org">Logtalk website</a></li>
    <li class="toctree-l1"><a class="reference internal" href="https://github.com/LogtalkDotOrg/logtalk3">GitHub repo</a></li>
    </ul>
  
        </div>
      </div>
    </nav>

    <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
          <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
          <a href="../index.html">The Logtalk Handbook</a>
      </nav>

      <div class="wy-nav-content">
        <div class="rst-content">
          <div role="navigation" aria-label="Page navigation">
  <ul class="wy-breadcrumbs">
      <li><a href="../index.html" class="icon icon-home" aria-label="Home"></a></li>
      <li class="breadcrumb-item active">FAQ</li>
      <li class="wy-breadcrumbs-aside">
              <a href="https://github.com/LogtalkDotOrg/logtalk3/blob/master/docs/handbook/sources/faq/index.rst" class="fa fa-github"> Edit on GitHub</a>
      </li>
  </ul>
  <hr/>
</div>
          <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
           <div itemprop="articleBody">
             
  <section id="faq">
<h1>FAQ<a class="headerlink" href="#faq" title="Link to this heading"></a></h1>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="general.html">General</a><ul>
<li class="toctree-l2"><a class="reference internal" href="general.html#why-are-all-versions-of-logtalk-numbered-2-x-or-3-x">Why are all versions of Logtalk numbered 2.x or 3.x?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#why-do-i-need-a-prolog-compiler-to-use-logtalk">Why do I need a Prolog compiler to use Logtalk?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#is-the-logtalk-implementation-based-on-prolog-modules">Is the Logtalk implementation based on Prolog modules?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#does-the-logtalk-implementation-use-term-expansion">Does the Logtalk implementation use term-expansion?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="compatibility.html">Compatibility</a><ul>
<li class="toctree-l2"><a class="reference internal" href="compatibility.html#what-are-the-backend-prolog-compiler-requirements-to-run-logtalk">What are the backend Prolog compiler requirements to run Logtalk?</a></li>
<li class="toctree-l2"><a class="reference internal" href="compatibility.html#can-i-use-constraint-based-packages-with-logtalk">Can I use constraint-based packages with Logtalk?</a></li>
<li class="toctree-l2"><a class="reference internal" href="compatibility.html#can-i-use-logtalk-objects-and-prolog-modules-at-the-same-time">Can I use Logtalk objects and Prolog modules at the same time?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="installation.html">Installation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="installation.html#the-integration-scripts-shortcuts-are-not-working">The integration scripts/shortcuts are not working!</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#i-get-errors-when-starting-up-logtalk-after-upgrading-to-the-latest-version">I get errors when starting up Logtalk after upgrading to the latest version!</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="portability.html">Portability</a><ul>
<li class="toctree-l2"><a class="reference internal" href="portability.html#are-my-logtalk-applications-portable-across-prolog-compilers">Are my Logtalk applications portable across Prolog compilers?</a></li>
<li class="toctree-l2"><a class="reference internal" href="portability.html#are-my-logtalk-applications-portable-across-operating-systems">Are my Logtalk applications portable across operating systems?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="programming.html">Programming</a><ul>
<li class="toctree-l2"><a class="reference internal" href="programming.html#should-i-use-prototypes-or-classes-in-my-application">Should I use prototypes or classes in my application?</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html#can-i-use-both-classes-and-prototypes-in-the-same-application">Can I use both classes and prototypes in the same application?</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html#can-i-mix-classes-and-prototypes-in-the-same-hierarchy">Can I mix classes and prototypes in the same hierarchy?</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html#can-i-use-a-protocol-or-a-category-with-both-prototypes-and-classes">Can I use a protocol or a category with both prototypes and classes?</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html#what-support-is-provided-in-logtalk-for-defining-and-using-components">What support is provided in Logtalk for defining and using components?</a></li>
<li class="toctree-l2"><a class="reference internal" href="programming.html#what-support-is-provided-in-logtalk-for-reflective-programming">What support is provided in Logtalk for reflective programming?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="troubleshooting.html">Troubleshooting</a><ul>
<li class="toctree-l2"><a class="reference internal" href="troubleshooting.html#using-compiler-options-on-calls-to-the-logtalk-compiling-and-loading-predicates-does-not-work">Using compiler options on calls to the Logtalk compiling and loading predicates does not work!</a></li>
<li class="toctree-l2"><a class="reference internal" href="troubleshooting.html#gecko-based-browsers-e-g-firefox-show-non-rendered-html-entities-when-browsing-xml-documenting-files">Gecko-based browsers (e.g., Firefox) show non-rendered HTML entities when browsing XML documenting files!</a></li>
<li class="toctree-l2"><a class="reference internal" href="troubleshooting.html#compiling-a-source-file-results-in-errors-or-warnings-but-the-logtalk-compiler-reports-a-successful-compilation-with-zero-errors-and-zero-warnings">Compiling a source file results in errors or warnings but the Logtalk compiler reports a successful compilation with zero errors and zero warnings!</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="usability.html">Usability</a><ul>
<li class="toctree-l2"><a class="reference internal" href="usability.html#is-there-a-shortcut-for-compiling-and-loading-source-files">Is there a shortcut for compiling and loading source files?</a></li>
<li class="toctree-l2"><a class="reference internal" href="usability.html#is-there-an-equivalent-directive-to-the-ensure-loaded-1-prolog-directive">Is there an equivalent directive to the <code class="docutils literal notranslate"><span class="pre">ensure_loaded/1</span></code> Prolog directive?</a></li>
<li class="toctree-l2"><a class="reference internal" href="usability.html#are-there-shortcuts-for-the-make-functionality">Are there shortcuts for the make functionality?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="deployment.html">Deployment</a><ul>
<li class="toctree-l2"><a class="reference internal" href="deployment.html#can-i-create-standalone-applications-with-logtalk">Can I create standalone applications with Logtalk?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="performance.html">Performance</a><ul>
<li class="toctree-l2"><a class="reference internal" href="performance.html#is-logtalk-implemented-as-a-meta-interpreter">Is Logtalk implemented as a meta-interpreter?</a></li>
<li class="toctree-l2"><a class="reference internal" href="performance.html#what-kind-of-code-logtalk-generates-when-compiling-objects-dynamic-code-static-code">What kind of code Logtalk generates when compiling objects? Dynamic code? Static code?</a></li>
<li class="toctree-l2"><a class="reference internal" href="performance.html#how-about-message-sending-performance-does-logtalk-use-static-binding-or-dynamic-binding">How about message-sending performance? Does Logtalk use static binding or dynamic binding?</a></li>
<li class="toctree-l2"><a class="reference internal" href="performance.html#which-prolog-dependent-factors-are-most-crucial-for-good-logtalk-performance">Which Prolog-dependent factors are most crucial for good Logtalk performance?</a></li>
<li class="toctree-l2"><a class="reference internal" href="performance.html#how-does-logtalk-performance-compare-with-plain-prolog-and-with-prolog-modules">How does Logtalk performance compare with plain Prolog and with Prolog modules?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="licensing.html">Licensing</a><ul>
<li class="toctree-l2"><a class="reference internal" href="licensing.html#what-s-the-logtalk-distribution-license">What’s the Logtalk distribution license?</a></li>
<li class="toctree-l2"><a class="reference internal" href="licensing.html#can-logtalk-be-used-in-commercial-applications">Can Logtalk be used in commercial applications?</a></li>
<li class="toctree-l2"><a class="reference internal" href="licensing.html#what-s-the-final-license-for-a-combination-of-logtalk-with-a-prolog-compiler">What’s the final license for a combination of Logtalk with a Prolog compiler?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="support.html">Support</a><ul>
<li class="toctree-l2"><a class="reference internal" href="support.html#are-there-professional-consulting-training-and-supporting-services">Are there professional consulting, training and supporting services?</a></li>
</ul>
</li>
</ul>
</div>
</section>


           </div>
          </div>
          <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
        <a href="../tutorial/profiling.html" class="btn btn-neutral float-left" title="Profiling programs" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
        <a href="general.html" class="btn btn-neutral float-right" title="General" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
    </div>

  <hr/>

  <div role="contentinfo">
    <p>&#169; Copyright 1998-2025, Paulo Moura.</p>
  </div>

  Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a
    <a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a>
    provided by <a href="https://readthedocs.org">Read the Docs</a>.
   

</footer>
        </div>
      </div>
    </section>
  </div>
  <script>
      jQuery(function () {
          SphinxRtdTheme.Navigation.enable(true);
      });
  </script> 

</body>
</html>